9 votes

Vintage vs modern B&W photography techniques differ in color luminance - what's going on here?

Just to expand on Matt's answer a bit. Most B&W films used during the first half of the 20th century were not panchromatic. They were much more sensitive to the energy in blue light than the ...
Michael C's user avatar
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6 votes
Accepted

Does red noise even at low ISO values mean a hardware problem with my camera's sensor?

No, this is not a problem. I see red noise. I see green noise. I see blue noise. That's not a surprise because there are three main colors in the Bayer filter, and the pixels beneath all of those ...
juhist's user avatar
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6 votes

Vintage vs modern B&W photography techniques differ in color luminance - what's going on here?

Photo films and digital sensors do not record colors exactly as seen by our eye / brain vision system. Initially, photo films were only sensitive to the violet and blue region of the visual spectrum....
Alan Marcus's user avatar
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5 votes
Accepted

Why the red colour light on the bridge appears differently in these two photograph?

IMO, the primary difference is that the iphone is implementing some version of HDR compositing of multiple exposures. It has at least two exposures combined; a lighter exposure for the sky and dark ...
Steven Kersting's user avatar
5 votes

Vintage vs modern B&W photography techniques differ in color luminance - what's going on here?

Are any of these in the ballpark? The last one: "imperfect chemical film response". Most black and white processes are not "panchromatic". That is, it does not respond the same way across the whole ...
mattdm's user avatar
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4 votes

Why does my subject's skin have such a red cast — did my auto white balance fail me?

Based on the sample images you've provided, AWB appears to be working fine. Neutral objects appear neutral: The plate, the concrete wall, the gravel path, the door, the gray shirt. You are likely not ...
xiota's user avatar
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3 votes

Does red noise even at low ISO values mean a hardware problem with my camera's sensor?

Your screenshots show ~300% magnification. For comparison, I have a 24" 1920x1200px (so ~94 ppi) monitor and viewing your picture at 30% zoom (which would roughly be the size at 300dpi), it just fills ...
flolilo's user avatar
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3 votes
Accepted

How can I desaturate reds in post-processing using Rawtherapee (or Gimp)?

Left is with HSV equalizer's S-value decreased, right is original. Only a very quick demonstration, so I did not bother to fine-tune it, so please forgive the ...
flolilo's user avatar
  • 6,468
1 vote

How can I desaturate reds in post-processing using Rawtherapee (or Gimp)?

A possible solution in Gimp: In the Channels list, right-click on the Green or Blue channels, and Channel to selection ...
xenoid's user avatar
  • 21.4k
1 vote

How can I desaturate reds in post-processing using Rawtherapee (or Gimp)?

RawTherapee has an HSV tool. HSV stands for 'Hue-Saturation-Value' where Value means luminance or brightness. Other image processing applications call the same type of tool 'HSL (Hue-Saturation-...
Michael C's user avatar
  • 175k
1 vote

Does red noise even at low ISO values mean a hardware problem with my camera's sensor?

The sensor used in Your Canon EOS Rebel SL2/200D is basically the same sensor used in the EOS 80D, the EOS Rebel T7i/800D, EOS-M M6, EOS-M M100, and 77D. It's Canon's current off-the-shelf APS-C ...
Michael C's user avatar
  • 175k
1 vote

Why does my subject's skin have such a red cast — did my auto white balance fail me?

To make it simple the Auto-WB more or less tries to make a grey picture. In the second picture, the WB likely compensates for the red brick wall, and so reduces the red (the door on the right is also ...
xenoid's user avatar
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